/*
 * Copyright 2017 Huawei Technologies Co., Ltd
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *    http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package io.servicecomb.swagger.generator.springmvc.processor.annotation;

import java.util.Arrays;

import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;

import io.servicecomb.swagger.generator.core.ClassAnnotationProcessor;
import io.servicecomb.swagger.generator.core.SwaggerGenerator;

import io.swagger.models.Swagger;

public class RequestMappingClassAnnotationProcessor implements ClassAnnotationProcessor {

    @Override
    public void process(Object annotation, SwaggerGenerator swaggerGenerator) {
        RequestMapping requestMapping = (RequestMapping) annotation;
        Swagger swagger = swaggerGenerator.getSwagger();

        this.processMethod(requestMapping.method(), swaggerGenerator);

        // path/value是等同的
        this.processPath(requestMapping.path(), swaggerGenerator);
        this.processPath(requestMapping.value(), swaggerGenerator);
        this.processConsumes(requestMapping.consumes(), swagger);
        this.processProduces(requestMapping.produces(), swagger);
    }

    protected void processPath(String[] paths, SwaggerGenerator swaggerGenerator) {
        if (null == paths || paths.length == 0) {
            return;
        }

        // swagger仅支持配一个basePath
        if (paths.length > 1) {
            throw new Error("not support multi path for " + swaggerGenerator.getCls().getName());
        }

        swaggerGenerator.setBasePath(paths[0]);
    }

    protected void processMethod(RequestMethod[] requestMethods, SwaggerGenerator swaggerGenerator) {
        if (null == requestMethods || requestMethods.length == 0) {
            return;
        }

        if (requestMethods.length > 1) {
            throw new Error(
                    "not allowed multi http method for " + swaggerGenerator.getCls().getName());
        }

        swaggerGenerator.setHttpMethod(requestMethods[0].name());
    }

    private void processConsumes(String[] consumes, Swagger swagger) {
        if (null == consumes || consumes.length == 0) {
            return;
        }

        swagger.setConsumes(Arrays.asList(consumes));
    }

    protected void processProduces(String[] produces, Swagger swagger) {
        if (null == produces || produces.length == 0) {
            return;
        }

        swagger.setProduces(Arrays.asList(produces));
    }
}
